HAWC's new energy estimator yields a Crab spectrum beyond 100 TeV and 95% confidence lower limits on the cutoff energy above 200 TeV for the hardest Galactic source.
First HAWC Spectra of Galactic Gamma-ray Sources Above 100 TeV and the Implications for Cosmic-ray Acceleration
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abstract
We present the first catalogs of the highest-energy (above 56 TeV and 100 TeV) gamma-ray sources seen by the High Altitude Water Cherenkov (HAWC) Observatory. The wide field-of-view of HAWC naturally lends itself to unbiased all-sky surveys and newly developed event-by-event gamma-ray energy reconstruction algorithms have allowed unprecedented energy resolution. The sources presented here are the highest-energy sources ever detected. All are coincident with known lower-energy gamma-ray sources within our Galaxy. These objects may have implications for the sources of Galactic cosmic rays; since Galactic CRs have been observed up to PeV energies, sources accelerating particles to these energies must exist. These sources, called "PeVatrons", would have corresponding hard gamma-ray spectra that extend to high energies without any spectral break or cutoff. We will present measurements of the spectra of these highest-energy gamma-ray sources and discuss if any of them can be identified as PeVatron candidates.
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The Spectrum of the Crab Nebula and Highest Energy Photons Measured by HAWC
HAWC's new energy estimator yields a Crab spectrum beyond 100 TeV and 95% confidence lower limits on the cutoff energy above 200 TeV for the hardest Galactic source.